Ternary Complexes of Light Rare Earths with B-15-C-5 and Bipyridyl

Abstract

Abstract: Six ternary complexes of rare earth (Ⅲ) nitrate (Ln=La-Eu) with benzo-l5-crown-5 and 2,2'-bipyridyl were prepared. They have the general formula of Ln(NO₃)₃·bipy·2H₂O·B-15-C-5. Their physico-chemical properties have also been studied with conductance, thermal analysis and 1Rspectrometry.The crystal structure of La(NO₃)₃·bipy·2H₂O·B-15-C-5 was determined. The crystal is monoclinic, with space group P₂₁/n. α=11. 951 (6)Å, 6=18. 181(7)Å. c=14. 754(5)Å; β=96. 19(3)°, V=3187. 0Å³, Z=4, D_c=1. 637 g/cm³. The final Ris 0. 035. In the title complex, two nitrogen atoms (from bipy) and eight oxygen atoms(six from nitrate anions and two from water molecules) coordinate to central ion La(Ⅲ) forming an irregular coordination polyhedron. The B-15-C-5 molecule is bound to a water molecule through hydrogen bonding.

Key words: Rare earth, B-15-C-5, Bipyridyl, Ternary complex, Crystal structure

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Yang Rui-na, Zhu Wen-xiang, Zhao Ji-zhou, Luo Bao-sheng, Chen Liao-rong. Ternary Complexes of Light Rare Earths with B-15-C-5 and Bipyridyl[J]. Chem. J. Chinese Universities, 1991, 12(3): 295.

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Ternary Complexes of Light Rare Earths with B-15-C-5 and Bipyridyl

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